As a leadup to the Symposium, we have published online the NMC Symposium on Mashup Discussion Draft as another publication in CommentPress format-- meaning that readers can attach comments, ask question for each paragraph of this white paper.
Help seed the ideas of discussion during the Symposium by posting comments today to this paper. Or add some examples, resources by tagging web sites in del.icio.us.
In addition, you can read the Data Mashups section of the 2008 NMC Horizon Report also online in CommentPress format.